Lai Heua Fai: Although not a religious ceremony, Lai Heua Fai (Floating of Light Boats) Festival falls on the same day as Ok Phansa, the last day of Buddhist Lent. It takes place in the evening when small floats made of banana leaves, flowers, candles and incense are set adrift on the nearest river or body of water to honor the Naga, the seven headed serpent spirit of the river. This act also symbolizes the floating away of bad luck, illness and past sins. Finally, the houses are encircled with lit candles that burn on into the night.
The offerings to the Naga are said to mimic those made long ago by the people of Laos as they prayed the Naga would assist their army in defeating that of the Thai in a boat race. The badly outnumbered Lao army had convinced the Thai army to settle their conflict by means of a boat race rather then a traditional battle. On the day of the race, the Lao army did prevail and the Thai army, honoring their agreement, retreated in defeat.
The following day, large festivals are held throughout the country. The most celebrated of them occurs in Vientiane, where a boat race is held.